Shrinking a VirtualBox VDI image

Mac is starting to complain about the lack of disk space. Searching around and i noticed that a very huge VDI image takes up 35G of space. And this VDI image is from a guest Windows XP operating system which is used for development work. The amount of disk space in the guest system reports only the usage of 15G. But the VDI image size is over 35G, a wastes of 20G! It should be reduced, but how!?

Some folders cannot be sorted?

Owning a Mac computer for nearly year but still find a lot of glitches in daily usage. As rumored as a very user friendly system, i find it not any easier than Windows. Here is a problem which bothered me for a long time until i searched the web for solution: When open some folders in finder, the title row is fixed and cannot be sorted.

How to dim the screen even more?

Working with MacBook Air in the dark is quite comfortable in one hand and uncomfortable in another hand. It has a nicely built backlit keyboard which let Mac newbie like me to find the keys easily. However, the LCD screen is too bright in the low light condition, even in the lowest brightness setting.

How to rotate Android Emulator on Mac?

I get use to develop Android apps on Windows platform and test the apps out on the Android Emulator. Screen rotation is notorious to Android developers as that is a great source of problems. Rotating Android Emulator is easy, disabling the Num lock and pressing 7 or 9 will do. There is no Num lock on the MacBook Air, how can the emulator be rotated?

K-Lite Codec for Mac?

Having a codec issue in Macintosh, the first fix comes to mind is to install the codecs. K-Lite Codec Pack immediately comes to my mind as I'm coming from the Windows' world. If you don't know what K-Lite Codec Pack is, you would be happy to know that it is the most powerful collection of codecs in Windows. Installing it allows video players in Windows to playback nearly 99% of video files.

How to playback Motion JPEG encoded video?

Yesterday I tested an Android app called "TimeLapse!" by ExplorerDC to record a timelapse video. That software is very easy to use and create high quality video, and free of charge. It produces video in AVI format which is motion jpeg encoded. It playbacks well in my Windows machine, but it doesn't play on my new MacBook Air!

How to change background color in applications?

Being an IT professional, i have to face the computer for quite a long time everyday. To reduce my eye strain, I usually change colors on screen to be a pleasantly comfortable one. Personally I dislike the pure white #FFFFFF which is the default one in most operating system. My favorite is #E4E4CB which is not too bright. How to achieve that to help my eyes?